JP7284141B2 - Polarizer - Google Patents

Description

The present invention relates to a polarizing plate.

A polarizing plate usually includes a polarizer layer containing a dye and a pair of optical resin films provided on both sides of the polarizer layer, and is used by bonding to a display panel such as a liquid crystal cell or an organic EL element. The outer periphery of the polarizing plate is generally shaped to match the outer periphery of the display portion of the display panel.

When the outer peripheral edge of the display portion of the display panel is not rectangular in plan view and has at least one of concave portions, convex portions, and curved portions, the outer peripheral edge of the polarizing plate used in this display portion is also the same. , it does not have a rectangular shape, but has at least one of concave, convex, and curved portions (see, for example, Patent Document 1).

JP 2018-92119 A

As a result of studies by the present inventors, it has been found that a polarizing plate having at least one of concave portions, convex portions, and curved portions, instead of a rectangular outer peripheral edge, has a wet heat effect compared to a polarizing plate having a rectangular outer peripheral edge. It has been found that the dye tends to come off from the polarizer layer in the environment, and the optical resin film tends to peel off from the polarizer at the end faces. Such a phenomenon is more likely to occur in recesses, protrusions, curved sections, and their vicinity than in straight sections.

The present invention has been made in view of the above circumstances, and provides a polarizing plate having at least one of concave portions, convex portions, and curved portions on the outer peripheral edge, in which dye loss is unlikely to occur in a moist and hot environment, and An object of the present invention is to provide a polarizing plate in which an optical resin film is not easily peeled off from a polarizer layer at the end face.

A polarizing plate according to the present invention comprises a polarizer layer, a first optical resin film provided on one surface of the polarizer layer, and a second optical resin film provided on the other surface of the polarizer layer. , provided. Then, when the polarizing plate is viewed from the thickness direction, the shape of the outer peripheral edge of the polarizing plate has at least one of a concave portion, a convex portion, and a curved portion, and the arithmetic mean height of the end face of the polarizer layer is The thickness Sa is 0.3 to 0.7 μm.

Another polarizing plate according to the present invention includes a polarizer layer, a first optical resin film provided on one surface of the polarizer layer, and a second optical resin film provided on the other surface of the polarizer layer. and an optical resin film. The root-mean-square height Sq of the end surface of the polarizer layer is 0.4 to 0.8 μm. The arithmetic mean height Sa of the end face may be 0.3-0.7 μm.

In the polarizing plate of the present invention, the maximum height Sz of the end surface of the polarizer layer may be 5.0 μm or less.

According to the present invention, in a polarizing plate in which the outer peripheral edge has at least one of concave portions, convex portions, and curved portions, dye removal is unlikely to occur in a moist and hot environment, and optical separation from the polarizer layer at the end face A polarizing plate in which the resin film is difficult to peel is provided.

FIG. 1 is a schematic cross-sectional view of a polarizing plate according to one embodiment of the present invention. 2(a) to 2(c) are top views of a polarizing plate according to one embodiment of the present invention. FIG. 3 is a cross-sectional view perpendicular to the axis near the cutting edge of the end mill.

Preferred embodiments of the present invention will be described below with reference to the drawings. In the drawings, similar components are provided with similar reference numerals. The present invention is not limited to the following embodiments.

(Polarizer)
FIG. 1 shows an end view of a polarizing plate 100 according to an example embodiment of the invention. The polarizing plate 100 according to this embodiment includes a first optical resin film 10, an adhesive layer 20, a polarizer layer 30, an adhesive layer 40, and a second optical resin film 50 in this order.

An example of the polarizer layer 30 is a resin layer dyed with a dichroic dye such as iodine or a dichroic dye, and may be stretched. The resin constituting this resin layer may be a hydrophobic resin, but is usually a hydrophilic resin. Examples of hydrophilic resins are polyvinyl alcohol resins, polyvinyl acetate resins and ethylene-vinyl acetate copolymer (EVA) resins. Examples of hydrophobic resins are polyamide resins and polyester resins. The polarizer layer 30 may be treated with boric acid after dyeing. A typical example of the polarizer layer 30 is a resin layer in which iodine is adsorbed and oriented on a polyvinyl alcohol film. When the resin layer, which is the polarizer layer, is composed of a hydrophilic resin such as a polyvinyl alcohol-based resin, the amount of water entering and leaving the outside is relatively large compared to a hydrophobic resin, and this is the reason why the dye is removed in a moist and hot environment. Also, the optical resin film is considered to be peeled off from the polarizer layer on the end surface.

The thickness of the polarizer layer 30 can be, for example, 2-30 μm, 2-15 μm, or 2-10 μm.

The first optical resin film 10 and the second optical resin film 50 are usually colorless and transparent resin films. Examples of such resin films include protective films, retardation films, brightness enhancement (reflective polarizer) films, antiglare films, surface antireflection films, reflective films, transflective films, viewing angle compensation films, and optical compensation films. film, touch sensor film, antistatic film and antifouling film.

Examples of resins that make up each optical resin film include cellulose resins (such as triacetyl cellulose), polyolefin resins (such as polypropylene resins), cyclic olefin resins (such as norbornene resins), and acrylic resins (polymethyl methacrylate). resins, etc.) or polyester resins (polyethylene terephthalate resins, etc.). The first optical resin film 10 and the second optical resin film 50 may be multilayer films.

The thickness of the first optical resin film 10 and the second optical resin film 50 may be, for example, 5-200 μm.

The materials and thicknesses of the first optical resin film 10 and the second optical resin film 50 may be the same or different.

The materials of the adhesive layers 20 and 40 are not particularly limited as long as they are transparent materials capable of bonding the polarizer layer 30 and the first optical resin film 10 or the second optical resin film 50 . One example of an adhesive is an epoxy resin. The epoxy resin may be, for example, a hydrogenated epoxy resin, a cycloaliphatic epoxy resin, or an aliphatic epoxy resin. Polymerization initiators (photocationic polymerization initiators, thermal cationic polymerization initiators, photoradical polymerization initiators, thermal radical polymerization initiators, etc.) or other additives (sensitizers, etc.) may be added to the epoxy resin. .

Other examples of adhesives are acrylic resins such as acrylamides, acrylates, urethane acrylates, and epoxy acrylates.

Other examples of adhesives are water-based adhesives such as polyvinyl alcohol-based resins.

Another example of an adhesive is a pressure sensitive adhesive. Examples of pressure-sensitive adhesives are pressure-sensitive adhesives containing acrylic resins, silicone-based resins, polyesters, polyurethanes, polyethers, or the like.
The polarizer layer 30 and the first optical resin film 10 may be laminated only with the adhesive layer 20 interposed therebetween. An easy adhesion layer (not shown) may be provided between the optical resin film 10 and the optical resin film 10 . Further, the polarizer layer 30 and the second optical resin film 50 may be laminated only with the adhesive layer 40 interposed therebetween. An easy adhesion layer (not shown) may be provided between 40 and the second optical resin film 50 . The easy-adhesion layer can improve the adhesion between the adhesive layers 20 and 40 and the polarizer layer 30, the first optical resin film 10, or the second optical resin film 50. FIG.

The thickness of the adhesive layer 20 may be, for example, 0.01 μm to 5 μm, 0.05 to 3 μm, or 0.1 to 1 μm. When using a pressure sensitive adhesive, the thickness of the adhesive layer 20 may be, for example, 2-500 μm, 2-200 μm, or 2-50 μm.

The overall thickness of the polarizer 100 may be, for example, 10-500 μm, 10-300 μm, or 10-200 μm.

Under the first optical resin film 10 or on the second optical resin film 50, a pressure-sensitive adhesive layer (sticky layer) and a separator film may be further provided. Further, a protective film may be further provided under the first optical resin film 10 or on the second optical resin film 50 .

The separator film is a film that can be peeled off from the pressure-sensitive adhesive layer and prevents foreign substances from adhering to the pressure-sensitive adhesive layer. For example, when the polarizing plate 100 is attached to an image display element, the separator film is peeled off to expose the pressure-sensitive adhesive layer. The resin constituting the separator film may be, for example, polyethylene-based resin, polypropylene-based resin, or polyester-based resin (polyethylene terephthalate, etc.).
The protective film is a film for preventing the first optical resin film 10 or the second optical resin film 50 from being damaged. It may also be a multilayer film composed of a pressure sensitive adhesive laminated to the film. The protection film can be peeled off from the first optical resin film 10 or the second optical resin film 50 on which it is provided. When the protective film is a multilayer film in which a pressure-sensitive adhesive is laminated on a resin film, the protective film is separated from the first optical resin film 10 or the second optical resin film 50 together with the pressure-sensitive adhesive. The resin of the protective film can also be the same as that of the separator film.

The thickness of the separator film and the protective film may be, for example, 2-500 μm, 2-200 μm, or 2-100 μm.

In the polarizing plate 100 according to the present embodiment, when viewed from the thickness direction, the outer peripheral edge P of the polarizing plate 100 is not formed only by straight lines (for example, a rectangle), but is formed by concave portions, convex portions, and curved portions. have at least one selected from the group;

For example, like the polarizing plate 100 shown in (a) of FIG. 2, the outer peripheral edge P has four linear portions PL that are perpendicular to each other and chamfered curved portions PR that are provided between the two linear portions PL. can have In other words, the outer peripheral edge P of the polarizing plate 100 is provided with chamfered curved portions PR at four corners of a rectangle.

Further, like the polarizing plate 100 shown in FIG. 2(b), a concave portion PD may be further provided for one linear portion PL of the outer peripheral edge P of the polarizing plate 100 shown in FIG. 2(a). Although the shape of the recess PD is not limited, for example, as shown in FIG. The shape may have a PDR and a chamfered curved portion PDR between the straight portion PDL and the straight portion PL. The curved portion PDR between the two straight portions PDL is concave toward the plane of the polarizing plate 100 . A chamfered curved portion PDR between the straight portion PDL and the straight portion PL has a convex shape facing out of the plane of the polarizing plate 100 .

Further, as in the polarizing plate 100 shown in (c) of FIG. 2, even if a convex portion PP is provided for one linear portion PL of the outer peripheral edge P of the polarizing plate 100 of (a) in FIG. good. Although the shape of the convex portion PP is not limited, for example, as shown in FIG. It may have a shape having a portion PPR and having a chamfered curved portion PPR between the straight portion PPL and the straight portion PL. A chamfered curved portion PPR between the two straight portions PPL is concave toward the plane of the polarizing plate 100 . A chamfered curved portion PPR between the straight portions PPL and PL has a convex shape facing out of the plane of the polarizing plate 100 .

Although there is no particular limitation on the depth of the concave portion PD from the straight portion PL and the height of the convex portion PP from the straight portion PL, they can typically be 1.0 mm or more. Also, the width of the concave portion PD and the width of the convex portion PP are not particularly limited, but can be typically 3.0 mm or more.

The shape of the concave portion PD and the convex portion PP is not limited to a rectangle with four corners rounded by chamfered curved portions as shown in (b) and (c) of FIG. It's okay.

The curve of each chamfer curve portion may be a circular arc, an elliptical arc, or a spline curve. The radius of curvature of each chamfered curved portion can be 1.0 to 40 mm.

Further, one to three of the four chamfered curved portions PR on the outer peripheral edge P of FIG. 2(a) may be simple corners that are not chamfered curves. At the outer peripheral edge P of FIGS. 2(b) and 2(c), one to four of the four chamfered curved portions PR may be simple corners that are not chamfered curves. Furthermore, the outer peripheral edge P does not have to be based on a rectangle as shown in FIGS.

Also, the absorption axis of the polarizer layer 30 can be oriented in any direction of the polarizing plate 100 according to the image display device or the like used.

(Arithmetic mean height Sa)
Returning to FIG. 1, in the polarizing plate 100 according to the embodiment of the present invention, the arithmetic mean height Sa of the end face of the polarizer layer 30 of the polarizing plate 100 is 0.3 to 0.7 μm. Sa may be 0.4 μm or more and may be 0.6 μm or less.

The arithmetic mean height Sa of the end surface of the polarizer layer 30 is defined as follows in an arbitrary two-dimensional measurement area 30A on the end surface. An XYZ coordinate system in which a plane parallel to the end face of the polarizer layer 30 is the XY plane, the height direction perpendicular to the end face is the Z direction, and the position of the average height in the two-dimensional measurement area 30A of the end face is Z=0. defined, and the height at each x-coordinate and each y-coordinate of the two-dimensional measurement area 30A is Z(x, y), the arithmetic mean height Sa is expressed by the following formula. Here, A is the area of the two-dimensional measurement area 30A.

A height Z(x, y) for each x, y in the two-dimensional measurement area 30A can be obtained by a scanning interference microscope, an atomic force microscope, or the like. The size of the two-dimensional measurement area 30A can be, for example, a rectangular area with a side of 5 to 1000 μm.

(root mean square height Sq)
Also, the root-mean-square height Sq of the end faces of the polarizer layer 30 can be 0.4 to 0.8 μm. Sq may be 0.5 μm or more and may be 0.7 μm or less.

A root-mean-square height Sq in an arbitrary two-dimensional measurement area 30A is defined by the following equation.

(maximum height Sz)
Also, the maximum height Sz of the end face of the polarizer layer 30 can be 5.0 μm or less. Sz may be 4.0 μm or less.

The maximum height Sz is the sum of the absolute values of the maximum peak height and the maximum valley depth in the two-dimensional measurement area 30A.

Measurement of the three-dimensional surface roughness in the two-dimensional measurement area 30A can comply with ISO25178.

Here, the two-dimensional measurement area 30A is preferably any straight portion on the outer peripheral edge P, that is, a flat portion on the end face, and may be a flat portion in the concave portion PD and the convex portion PP. , flat portions other than the concave portion PD and the convex portion PP, for example, flat portions on four straight line portions PL that are perpendicular to each other.

As will be described later, unlike a polarizing plate in which the outer peripheral edge P is formed only from linear portions, the end face of a polarizing plate having concave portions, convex portions, or curved portions cannot be cut by a surface grinder to adjust dimensions. . Therefore, the end face of such a polarizing plate is usually cut with an end mill over the entire circumference. Therefore, it has roughly the same surface roughness anywhere on the end face.
The linear portion of the outer peripheral edge P, that is, the flat portion of the end face, is preferable as the two-dimensional measurement area 30A because the surface where the average height is 0 is flat and the Z=0 surface can be easily determined.

It is also preferable that the two-dimensional measurement area 30A is located at the end of the polarizer layer 30 in the absorption axis (stretching direction) direction. If the two-dimensional measurement area 30A is located at the end of the absorption axis direction, this area 30A intersects the absorption axis of the polarizer layer 30. FIG.

When the arithmetic mean height Sa of the end face of the polarizer layer 30 is large, the surface area of the end face becomes large, and thus the loss of dye tends to increase in a moist and hot environment. On the other hand, when the arithmetic mean height Sa at the end surface of the polarizer layer 30 is small, the peeling amount of the first optical resin film 10 and/or the second optical resin film 50 from the polarizer layer 30 tends to increase. . The state where Sa is small corresponds to the state in which the end face is not polished while being punched with a Thomson blade, and it is presumed that this is due to the peeling of the optical resin film due to the impact of punching.

If the root-mean-square height Sq of the end surface of the polarizer layer 30 is large, the surface area of the end surface becomes large, and thus the dye element loss tends to increase in a moist and heat environment. On the other hand, when the root-mean-square height Sq of the end faces of the polarizer layer 30 is small, the amount of peeling of the first optical resin film 10 and/or the second optical resin film 50 from the polarizer layer 30 tends to increase. There is

When the maximum height Sz of the end surface of the polarizer layer 30 is large, the surface area of the end surface becomes large, so that there is a tendency that the loss of dye element in a moist and heat environment becomes large.

Such a polarizing plate can be used in an image display device such as a liquid crystal display device or an organic EL display device, for example, by bonding it to a display panel such as a liquid crystal cell or an organic EL element. A liquid crystal display device may include, for example, a liquid crystal cell and the above-described polarizing plate attached to one surface or both surfaces of the liquid crystal cell. An organic EL display device may include, for example, an organic EL element and the above-described polarizing plate attached to the surface of the organic EL element. Two polarizing plates are usually arranged in the liquid crystal cell.

(Manufacturing method of polarizing plate)
Next, a method for manufacturing the polarizing plate 100 will be described.
First, a raw sheet of the polarizing plate 100 having the layer structure described above is manufactured by a known method. Subsequently, the original film is punched out with a cutting tool such as a Thomson blade to obtain a polarizing plate having an outer peripheral edge P with concave portions, convex portions, or curved portions. Here, since it is difficult to ensure sufficient dimensional accuracy at the outer peripheral edge P only by cutting with a Thomson blade, the end surface is ground.

When the outer peripheral edge P has a concave portion, a convex portion, or a curved portion, a surface grinding device such as that used for grinding the end face of a rectangular polarizing plate, that is, a plurality of tools are arranged in the circumferential direction on one main surface. Since it is not possible to grind the entire end face using a machine that cuts the rotating disk by contacting the end face of the polarizing plate so that the main surface and the end face of the polarizing plate are parallel, an end mill is used. The entire end surface of the polarizing plate is cut. More specifically, by making the axial direction of the end mill parallel to the thickness direction of the polarizing plate and relatively moving the end mill and the polarizing plate along the end face of the polarizing plate, the end face of the polarizing plate is cut to obtain a desired dimension. match the

Here, it is preferable to use an end mill having a helical blade, and in particular, it is preferable to use an end mill in which dZ and dZ/dX in FIG. 3 are small in the cross-sectional shape of the blade.

Here, FIG. 3 is a sectional view of the tip of the blade 80 in a section perpendicular to the axis of the end mill, and the direction of rotation of the end mill is C. As shown in FIG. The blade 80 has a cutting edge 80t and a surface 80d behind the cutting edge 80t. This surface 80d can come into contact with the cutting object T immediately after cutting by the cutting edge 80t. In this embodiment, the straight line Q connecting the cutting edge 80t and the rotation axis AX of the end mill is used as a reference, the cutting edge 80t is used as a starting point, and the scanning interference is moved along a straight line AB that is orthogonal to the straight line Q and passes through the cutting edge 80t. A microscope is used to measure the profile of the height of the surface 80d with respect to the straight line AB. Then, from this profile, dZ [μm], which is the maximum height of the surface 80d, and the distance dX [μm] from the cutting edge 80t in the AB direction that gives dZ are obtained.

At this time, it is preferable to use an end mill having a cutting edge satisfying dZ≦1.0 μm and dZ/dX≦4. As a result, the surface roughness of the end surface 20e of the polarizer layer 30 can easily be set within the range described above. Even end mills with helical blades, where dZ>1.0 μm or dZ/dX>4, tend to have too large a surface roughness.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

For example, one or both of adhesive layers 20 and 40 can be omitted.

EXAMPLES The content of the present invention will be more specifically described below with reference to examples and comparative examples. In addition, the present invention is not limited to the following examples.

[Example 1]
A polarizer (thickness: 8 μm) in which iodine was adsorbed and oriented in the polyvinyl alcohol-based resin was produced by stretching a 20 μm-thick polyvinyl alcohol-based resin film and dyeing it with iodine. A cyclic olefin resin (COP) film (manufactured by Nippon Zeon Co., Ltd., thickness 13 μm) was bonded to one surface of this polarizer via a water-based adhesive. Further, the acrylic pressure-sensitive adhesive layer A (thickness: 20 μm) formed on the release film was laminated on the COP film. An acrylic pressure-sensitive adhesive layer B (thickness: 5 μm) formed on a release film was laminated on the other surface of the polarizer. A brightness enhancement film (APF-V3, thickness 30 μm, reflective polarizer manufactured by 3M) having a protective film on the upper surface was laminated on the acrylic pressure-sensitive adhesive layer B exposed by peeling the release film.
In this way, a raw polarizing plate consisting of release film/acrylic pressure-sensitive adhesive layer A/COP film/water-based adhesive/polarizer/acrylic pressure-sensitive adhesive layer B/brightness enhancement film/protection film was produced.

A polarizing plate 100 having recesses PD having the shape shown in FIG. The length of the long side of the rectangle is 140 mm, the length of the short side of the rectangle is 70 mm, the depth of the recess is 5 mm, the width of the recess is 30 mm, the radius of curvature of the chamfered curved portion PR is approximately 10 to 12 mm, and the chamfered curved portion PDR. The radius of curvature of was set to approximately 3 mm. The polarizing plate 100 has one concave portion PD. This recess PD is substantially rectangular. This concave portion PD has three straight portions PDL that are adjacent to each other and orthogonal to each other. A chamfered curved portion PDR is provided between the straight portions PDL. A chamfered curved portion PDR is provided between the straight portion PDL and the straight portion PL. The absorption axis 31 of this polarizing plate 100 is orthogonal to the depth direction of the recess PD, and is the horizontal direction in FIG. 2(b).

Using an end mill having a helical blade with an average dZ of 0.6 μm and an average dZ/dX of 2.2, the entire circumference of the end face was polished to adjust the dimensions, and the polarizing plate of Example 1 was obtained. Obtained.

(Comparative example 1)
A polarizing plate of Comparative Example 1 was obtained in the same manner as in Example 1, except that the end face was polished using an end mill having a helical blade with an average dZ of 1.4 μm and an average dZ/dX of 14. .

(Comparative example 2)
A polarizing plate of Comparative Example 2 was obtained in the same manner as in Comparative Example 1, except that the end face was not polished with an end mill and was cut out with a Thomson blade.

(Measurement of roughness Sa, Sq, Sz on three-dimensional surface)
A height function Z(x, y) of the end surface of the polarizer layer was obtained with the following microscope.
Scanning white interference microscope VS1000 series Hitachi High-Tech Science Co., Ltd. Measurement conditions: Objective lens: 50x
Two-dimensional measurement area: length (thickness direction) 5 to 8 μm × width (direction perpendicular to thickness direction) 150 to 150 μm in the straight part (plane perpendicular to the absorption axis) of the end surface of the polarizer layer (PVA layer) of the polarizing plate. 300 μm
Based on the obtained function Z, Sa, Sq and Sz were obtained based on the above formulas. The end faces where Sa, Sq and Sz were measured were positioned on the left and right linear portions PL in FIG. Note that Sa, Sq, and Sz in each polarizing plate 100 show similar values over the entire circumference.

(Evaluation of iodine removal)
The polarizing plates obtained in Examples or Comparative Examples were left in an environment of 65° C. and 90% relative humidity for 500 hours.
After that, two polarizing plates (one of which is a polarizing plate of an example or a comparative example, and the other of which is a commercially available normal polarizing plate) are placed in crossed Nicols, and the edges are observed over the entire circumference using an optical microscope. , the width from the edge of the region (light leakage) where light attenuation does not occur corresponding to crossed nicols was measured. This leakage of light occurs due to the absence of iodine, which plays a role in expressing the polarization performance. It should be noted that the light escape occurs in the vicinity of the recess PD in FIG. 2, and the maximum width was determined as the iodine escape.

(Evaluation of peeling amount of brightness enhancement film)
Evaluated by reflection microscopy.

Table 1 shows the conditions and results.

In Examples, it was possible to reduce the peeling amount of the brightness enhancement film while reducing the amount of iodine escaped.

The polarizing plate according to the present invention is applied, for example, to a liquid crystal cell, an organic EL element, or the like, and used as an optical component constituting an image display device such as a liquid crystal television, an organic EL television, or a smartphone.

DESCRIPTION OF SYMBOLS 10... First optical resin film, 30... Polarizer layer, 50... Second optical resin film, P... Peripheral edge, PP... Convex part, PD... Concave part, PR, PDR, PPR... Chamfered curve part, 100... Polarizing plate .

Claims (3)

A polarizer layer, a first optical resin film provided on one surface of the polarizer layer, a second optical resin film provided on the other surface of the polarizer layer, and the second optical resin film. A polarizing plate further comprising a protective film thereon,
The polarizer layer and the first optical resin film are laminated only through an adhesive layer that is an adhesive containing an epoxy resin, an adhesive containing an acrylic resin, or a water-based adhesive,
The polarizer layer and the second optical resin film are laminated via only an adhesive layer that is a pressure-sensitive adhesive,
When the polarizing plate is viewed from the thickness direction, the shape of the outer peripheral edge of the polarizing plate has a concave portion ,
The end face of the polarizer layer is polished,
The root-mean-square height Sq of the end face of the polarizer layer is 0.4 to 0.8 μm,
The arithmetic mean height Sa of the end surface of the polarizer layer is 0.3 to 0.7 μm,
The protective film is a multilayer film obtained by laminating a pressure-sensitive adhesive on a resin film,
The polarizing plate, wherein the protective film is peelable from the second optical resin film together with the pressure-sensitive adhesive layer. 2. The polarizing plate according to claim 1, wherein the maximum height Sz of the end face of said polarizer layer is 5.0 [mu]m or less. The polarizing plate according to claim 1 or 2, wherein the second optical resin film is a brightness enhancement film.

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